Fixed compiler warnings about casting from const char * to char *.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@11176 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/include/pub_tool_clientstate.h b/include/pub_tool_clientstate.h
index 9431783..81df4e5 100644
--- a/include/pub_tool_clientstate.h
+++ b/include/pub_tool_clientstate.h
@@ -60,7 +60,7 @@
 
 /* The name of the client executable, as specified on the command
    line. */
-extern HChar* VG_(args_the_exename);
+extern const HChar* VG_(args_the_exename);
 
 
 #endif   // __PUB_TOOL_CLIENTSTATE_H